Burglar-alarm.



' or window in closed'position, whereby an mechanism employed for locking the door alarm will be given upon operation of the locking mechanism previous to opening of the door or window. It will also be clearly apparent that this form of alarm may be wound and set, as desired, and locked against operation until the fastening mechanism for the-door or window with which the alarm is connected, is, operated to allow rotation of the main shaft of the alarm meohanism under tension of the spring secured thereto.

While I have shown the preferred embodiment of my invention, it will be under stood that minor changes in the details of construction and arrangement of parts may be made within the scope of the appended claims without departing from the spirit of my invention or sacrificing any of the advantages of the same.

What is claimed isz-- In a burglar alarm, the combination with ja gong and a hammer mechanism coacting I therewith and including an anchor, of means .crown wheel carried for actuating the hammer embodying a spring actuated shaft ara'tehetlwheel and a V byi tlief' shaft, the""latter being engaged by the anchor, a slidable dog normally engaging the ratchet wheel, 'a 1'0- tatable dog releasing member, and a link loosely connecting the dogand the rotatable JOHN P. PEARCE.

. mark Witnesses:

JOHN F. SILLs, W. P. GOODWIN. 

